Imported Upstream version 1.4upstream/1.4

1 files changed, 0 insertions, 130 deletions

diff --git a/src/pkg/math/tan.go b/src/pkg/math/tan.go
deleted file mode 100644
index 285eff1ab..000000000
--- a/src/pkg/math/tan.go
+++ /dev/null
@@ -1,130 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package math
-
-/*
-	Floating-point tangent.
-*/
-
-// The original C code, the long comment, and the constants
-// below were from http://netlib.sandia.gov/cephes/cmath/sin.c,
-// available from http://www.netlib.org/cephes/cmath.tgz.
-// The go code is a simplified version of the original C.
-//
-//      tan.c
-//
-//      Circular tangent
-//
-// SYNOPSIS:
-//
-// double x, y, tan();
-// y = tan( x );
-//
-// DESCRIPTION:
-//
-// Returns the circular tangent of the radian argument x.
-//
-// Range reduction is modulo pi/4.  A rational function
-//       x + x**3 P(x**2)/Q(x**2)
-// is employed in the basic interval [0, pi/4].
-//
-// ACCURACY:
-//                      Relative error:
-// arithmetic   domain     # trials      peak         rms
-//    DEC      +-1.07e9      44000      4.1e-17     1.0e-17
-//    IEEE     +-1.07e9      30000      2.9e-16     8.1e-17
-//
-// Partial loss of accuracy begins to occur at x = 2**30 = 1.074e9.  The loss
-// is not gradual, but jumps suddenly to about 1 part in 10e7.  Results may
-// be meaningless for x > 2**49 = 5.6e14.
-// [Accuracy loss statement from sin.go comments.]
-//
-// Cephes Math Library Release 2.8:  June, 2000
-// Copyright 1984, 1987, 1989, 1992, 2000 by Stephen L. Moshier
-//
-// The readme file at http://netlib.sandia.gov/cephes/ says:
-//    Some software in this archive may be from the book _Methods and
-// Programs for Mathematical Functions_ (Prentice-Hall or Simon & Schuster
-// International, 1989) or from the Cephes Mathematical Library, a
-// commercial product. In either event, it is copyrighted by the author.
-// What you see here may be used freely but it comes with no support or
-// guarantee.
-//
-//   The two known misprints in the book are repaired here in the
-// source listings for the gamma function and the incomplete beta
-// integral.
-//
-//   Stephen L. Moshier
-//   moshier@na-net.ornl.gov
-
-// tan coefficients
-var _tanP = [...]float64{
-	-1.30936939181383777646E4, // 0xc0c992d8d24f3f38
-	1.15351664838587416140E6,  // 0x413199eca5fc9ddd
-	-1.79565251976484877988E7, // 0xc1711fead3299176
-}
-var _tanQ = [...]float64{
-	1.00000000000000000000E0,
-	1.36812963470692954678E4,  //0x40cab8a5eeb36572
-	-1.32089234440210967447E6, //0xc13427bc582abc96
-	2.50083801823357915839E7,  //0x4177d98fc2ead8ef
-	-5.38695755929454629881E7, //0xc189afe03cbe5a31
-}
-
-// Tan returns the tangent of the radian argument x.
-//
-// Special cases are:
-//	Tan(±0) = ±0
-//	Tan(±Inf) = NaN
-//	Tan(NaN) = NaN
-func Tan(x float64) float64
-
-func tan(x float64) float64 {
-	const (
-		PI4A = 7.85398125648498535156E-1                             // 0x3fe921fb40000000, Pi/4 split into three parts
-		PI4B = 3.77489470793079817668E-8                             // 0x3e64442d00000000,
-		PI4C = 2.69515142907905952645E-15                            // 0x3ce8469898cc5170,
-		M4PI = 1.273239544735162542821171882678754627704620361328125 // 4/pi
-	)
-	// special cases
-	switch {
-	case x == 0 || IsNaN(x):
-		return x // return ±0 || NaN()
-	case IsInf(x, 0):
-		return NaN()
-	}
-
-	// make argument positive but save the sign
-	sign := false
-	if x < 0 {
-		x = -x
-		sign = true
-	}
-
-	j := int64(x * M4PI) // integer part of x/(Pi/4), as integer for tests on the phase angle
-	y := float64(j)      // integer part of x/(Pi/4), as float
-
-	/* map zeros and singularities to origin */
-	if j&1 == 1 {
-		j += 1
-		y += 1
-	}
-
-	z := ((x - y*PI4A) - y*PI4B) - y*PI4C
-	zz := z * z
-
-	if zz > 1e-14 {
-		y = z + z*(zz*(((_tanP[0]*zz)+_tanP[1])*zz+_tanP[2])/((((zz+_tanQ[1])*zz+_tanQ[2])*zz+_tanQ[3])*zz+_tanQ[4]))
-	} else {
-		y = z
-	}
-	if j&2 == 2 {
-		y = -1 / y
-	}
-	if sign {
-		y = -y
-	}
-	return y
-}